untrustworthy

I adjective capricious, changeable, conniving, deceitful, deceptive, dishonest, dishonorable, disloyal, double-dealing, faithless, fallible, false, fickle, fly-by-night, fraudulent, frivolous, illusive, inconstant, insecure, insidious, irresponsible, mercurial, perfidious, precarious, questionable, shifty, slippery, tergiversating, treacherous, two-faced, unauthenticated, uncertain, undependable, unfaithful, unreliable, unsafe, unsound, unstable, unsteadfast, untrue, unworthy of confidence, unworthy of trust, variable, wavering II index dangerous, dishonest, disingenuous, disreputable, faithless, fallible, false (disloyal), fraudulent, inaccurate, insecure, irresponsible, machiavellian, perfidious, precarious, recreant, sinister, suspicious (distrustful), uncertain (questionable), undependable, unreliable, unsound (not strong), unsustainable, untrue